it's an apparent weightlessness, because everything, your whole environment, the people in the space shuttle. you look up in a space shuttle. your friends say, "hey, look at those dudes up there, honey, they got no gravity." they get no gravity 'cause they seem to be floating around. they take this ball out, let it go and just hover right there. take a pen out like that, it just kinda floats in front. it looks like there's no gravity 'cause the tv cameras inside are recording that and they see the astronaut type like that and they see it floating like this. hey, no gravity up there. it's a common idea that there's no gravity up where the satellites are. what do you guys say? if you use that equation to guide you thinking, 'd' up there is not very much bigger than it is down here. that 'd' is toward the center of the world. newton figured that out. when you wanna measure the force of gravity between you and the world, you take a distance between your belly button and the distance to the earth's belly button, that's the center of mass that distance and when you go 100 miles high, honey